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Structural characterization of the scale formed on a Ti–46Al–8Nb alloy oxidised in air at 700 C

Tchoupé Ngnekou, Paul Ervé and Lafont, Marie-Christine and Senocq, François and Laffont-Dantras, Lydia and Viguier, Bernard and Lacaze, Jacques Structural characterization of the scale formed on a Ti–46Al–8Nb alloy oxidised in air at 700 C. (2010) Intermetallics, vol. 18 (n° 2). pp. 226-232. ISSN 0966-9795

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Official URL: http://dx.doi.org/10.1016/j.intermet.2009.07.013

Abstract

The structures of the oxide scale formed on a lamellar (gþ a2) Ti46Al8Nb alloy after heat-treatment in air at 700 C for 50 and 1000 h have been compared. Though the outer scale is thicker after 1000 h, both oxide scales are similarly layered with an outer aluminium-rich layer. The main difference is that the aluminium-rich oxide is amorphous after 50 h while it becomes cubic gamma alumina after 1000 h. After 50 h, the presence of TiN was detected at the interface between the scale and the base metal. After 1000 h of oxidation, the subscale region is divided into two clearly separated zones differing by their composition, with a thick TiN layer close to the oxide scale. From these observations, it appears that the development of the oxide scale at 700 C is similar to the scheme proposed in the literature for short times at higher temperatures, with the initial formation of a transient aluminium-rich oxide layer, which here is amorphous, and precipitates of TiN at the scale/metal interface that oxidise afterwards to rutile

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Intermetallics website : http://www.sciencedirect.com/science/journal/09669795
Audience (journal):International peer-reviewed journal
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Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Nihad Lahdifi

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